Are they? It's easy to walk down the slippery road that leads to authoritarian behaviors.
So I would disagree that "conspiracy theories are problematic." Some are problematic, but there are also some that turn out to be extremely important. No progress is made without questioning authority and the status quo.
Investigating wrongdoing and backing up findings with evidence is extremely important. Spouting unfounded lies is not.
To me, the latter is too big a price to pay for the former.
If so, where do you propose the line exists?
If not, I would suggest you're advocating that the "loudest" voice (where volume is measured by firepower) always gets their way.
Clearly not - we know that it is possible for elections to be fraudulent and people can talk about it. We don't yet live in a post-truth society. Evidence counts.